Optical drilling tool



April 6,v 1937. E. LEI-rz, JR

OPTICAL DRILLING TOOL.

Filed DCC. 14, 1935 2 Sheets-Shes? 1 l@ 1 f avvvvw l l.. au a 1 1 INVENTOR j BY -Q/M ATTOR EY April 6, 1937. E. LEITZ, JR l 2,075,355

OPTICAL DRILLING TOOL Filed Deo. 14, 1935 2 Sheets-Sheet 2 @IQ- z\. l'l 21 Patented Apr.` 6. 1937 or'rlcAL BILLING 'ro'oLv zum neun, Ernst Jr., Wetzlar, Germany, assigner to Leitz, G. m. b. ll., Wetzlar, Germany Application Y 3 Claims. The object of this invention is to provide a drilling tool with optical means whereby the work mayl be inspected from time to time during'the drilling operation without removing the tool from the work.

Such a tool is of particular advantage in cases where for instance the operations require marking, by boring, of centres of holes to be bored or drilled, or where other marks are required to be made for other purposes. In' the manufacture of precision instruments or parts of -machinery absolute exactness .is -often or always oi y the greatest importance. In such cases it is neces-- befrequently inspected. Heresary that the work tofore such inspections have required the use of two pieces of apparatus, namely the drilling tool and the optical instrument, for example a microscope. Not only is such a procedure expensive and slow but it does not insure absolute exactness because it is very diiilcult to place the optical axis of a microscope in exact alinement with the working axis oi the drill or-too'l. The present invention accomplishes the object with only one piece of apparatus and insures absolute exactness in that the tool axis is permanently coincidental with the optical observation axis.

'Ihe invention is accordingly embodiedin 'a drilling tool with a built-in optical system for observing the work. ranged that only the tool itself need be removed for observation purposes.

operation is to be resumed the ocular is removed and the tool coupled to its usual driving means.

In the accompanying drawings illustrating the invention Fig. .l is a longitudinal sectional view illustrating a drilling tool embodying the invention.

Fig. 2 is a rear end view of the tool. Fig. 3 is a view similar to Figure l but shows a different more developed optical system which may be used for purposes of greater exactness.

Fig. 4 is an end view of the prism shown in Figure 3.

Referring to Figures 1 andj2 the reference numeral l denotes the tool casing of usual tubular form which by means of a suitable bracket 2 is secured to a drilling machine in a usual and well known manner, not illustrated. The drilling tool I is detachably secured to the hollow drill shaft 5o 4^by means of a well known form of chuck 5. The shaft 4 is supported within the movable guide tube i' by means of ball bearings 'I and 8. At the other end of the tool there is a coupling ring 9 for connecting the eye piece or ocular l0 to the 55 tool. Il indicates the usual cross or sight made The apparatus is so ar- When the drilling.

December 14, 1935, serial No. 54,383

Germany Januar! 2, 1935 s' PATENT oFFlcs y (Cl. J7-5) 1 of ilne threads. fA lever I2 is operated in the usual manner to feed the drill. il is a detachable cap. The lens I4 is mounted permanently withinforms together with the the hollow shaft 4 and ocular lil a complete optical system as is obvious. 5 When the t'ool is to be used for drilling, the

drill 3 is attached to the I3 being of course. nrst removed placed. At the other end or the tool the coupling 9 is likewise removed so that the projecting shaft `4 may be attached to any anism. Such driving mechanism manually operated handle the drill is used for driving mechanism or art and are therefore not sired to inspect the work, wards by means of mit the cap i3 and the driving means or handle, connected from the shaft 4. attached and the work may then be the drawings the tool suitable driving mechmay of course `be of a very simple nature, for instance a mere may be attached when marking purposes. l Buch handles are known in the shown. When it is dethe tool is moved rearthe lever I2 in order to pertool l to be removed. The

if such is used, is dis- The ocular is then is shown at the moment when it is ready for optical use by simply removing the cap I3 and the drill I.

Figiire 3 illustrates a shown in Figure 1 but provided elaborate optical exactness and a tion. ,This figure also shows a ferently constructed drilling tool.

drilling tool of the type with amore. system for purposes oi greater wider scope of optical observasomewhat dif- It is obvious thatthe invention is not limited to any particular mechanical form of drilling tool but is applicable to drilling tools'capable of including drilling shaft tol support a hollow the optical system.

' In Figure 3 therefore reference will be made only to the parts directly involved in the invention. In this ligure operatively connected to the the drill. 2B is detachably hollow drill shaft 2i by means o! a suitable clutch 22. 2l is the movable guiding tu ing or tube 24.

supported withinthe outer cas- The operating lever is designated Y I2 as in Figure 1. 25 is the ocular removably held by coupling means as at 28. The optical system in two lenses 21 and 23, and glass body 29. The latter consists of fleeting prisms lli, 3l and silvered surfaces 23 and partly rounded surfaces as pleted bodies 35 and 3B. Hence the glass 29 has a complete cylindrical surface Figure 3 comprise the a cylindrical optical three re- 32 having coincidental 34. The prisms'ha've shown in Figure 4 y and the cylindrical form oi the body 29 is comby the non-reilecting segmental glass or prism body 40 which shaft 4 as usual, the cap and then reare divided in the surface 33.

is supported within the recess Il in the hollow shari.

l0 a laterally displaced and inverted image as will be understood by persons skilled in the art. The optical system in Figure 3 serves the purposes oi' greater exactness and a wider scope of observation.

'I'he operation of the device Figure 3 is the same as that described above. When optical observation is desired, the. drill is disconnected and the ocular is attached. It will be understood that the invention is not limited to 20 the precise forms illustrated. and` described but -that changes may be made without departing from the principle of the invention and the scope of the appended claims.. It will further be understood that the optical system need not -25 necessarily be combined with a drilling tool.

The scope of' the invention is intended to include tools other than drilling tools.

I claim:

1. In a working tool including a hollow operating shaft, an optical system in said shaft,

means foi detachably connecting a tool to one end of said shaft being driven thereby and means forv detachably connecting the ocular of said optical system to the other end of said shaft whereby to observe the work when said tool is detached, the optical axis of said-optical system being coincidental with the operable axis of the said shaft and tool.

2. A tool comprising in combination a hollow shaft, means for detachably securing a drilling tool to one end of the shaft to be operated thereby, a lens permanently mounted in the shaft, means for detachably securing an ocular at -the other end of said shaft to form a microscope together with the said lens, the optical axis of the said ocular and lens coinciding with the operating axis of the said drillingtool and means for supporting said shaft.

3. A tool comprising in combination a hollow shaft, means for detachably securing a drilling tool to one end of the shaft to be operated thereby, a plurality of optical bodies permanently mounted in the shaft, means for detachably securing an ocular at the other end of said shaft to form a microscope together with the said optical bodies, the optical axis of the said ocular and optical bodies coinciding with the operating axis of the said drilling tool and means for supporting said shaft.

ERNST LEITZ. Jn. 

